
/**************************************************************************
 * Copyright (C) 2011 Tyler Robertson
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 **************************************************************************/

/************************************************************************
 *
 * Original CRC function taken from 
 * http://tomoyo.sourceforge.jp/cgi-bin/lxr/source/lib/crc16.c
 *
 * Modified types for use with avr microcontroller.
 *
 ***********************************************************************/

#ifndef __CRC16_H__
#define __CRC16_H__

#ifdef __cplusplus
extern "C" {
#endif

extern const unsigned short crc16_table[256];

unsigned short crc16( unsigned short crc, const unsigned char *data, unsigned long length );

static inline unsigned short crc16_byte( unsigned short crc, const unsigned char data )
{
	return (crc >> 8) ^ crc16_table[ (crc ^ data) & 0xFF ];
}
	
#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* __CRC_H__ */
